We did Alaska first class in July from DFW to Seattle and back. Our DFW to Seattle plane was older and the wifi didn't work and the seats had seen some miles. The return flight had the nice seats with a footrest, etc and all of the in-flight entertainment.
We also learned that first class now only gets lounge access if one of your flights is over 2100 miles. We had about 4 hours so we did pay the $30 per person day rate which they offer if the flight is less than 2100. We ended up seeing 2 lounges because of gate changes and they are very nice.